CN112363560A - Control and distribution method and device of photovoltaic power generation system - Google Patents

Control and distribution method and device of photovoltaic power generation system Download PDF

Info

Publication number
CN112363560A
CN112363560A CN202011122870.8A CN202011122870A CN112363560A CN 112363560 A CN112363560 A CN 112363560A CN 202011122870 A CN202011122870 A CN 202011122870A CN 112363560 A CN112363560 A CN 112363560A
Authority
CN
China
Prior art keywords
power generation
photovoltaic power
current
load
total
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011122870.8A
Other languages
Chinese (zh)
Inventor
王华云
徐岸非
邓志祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN202011122870.8A priority Critical patent/CN112363560A/en
Publication of CN112363560A publication Critical patent/CN112363560A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66—Regulating electric power
    • G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
    • G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2639—Energy management, use maximum of cheap power, keep peak load low
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • General Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a control and distribution method and a device of a photovoltaic power generation system, wherein the photovoltaic power generation system comprises a load and a photovoltaic power generation device connected with the load, and the control method comprises the following steps: presetting at least one voltage-power characteristic curve; responding to the obtained total power of the current load, and judging whether the variation of the current total power is larger than a preset trigger threshold value or not; and if the current variation of the total power is larger than the trigger threshold, controlling the photovoltaic power generation device to execute another voltage-power characteristic curve. By collecting and analyzing parameters such as voltage and current on a line, the photovoltaic power generation device can be dynamically controlled to work near the maximum efficiency point all the time, so that the purposes of energy saving and efficiency improvement are achieved, and by adopting a power dynamic distribution mode, the load charging requirement can be met on the basis of greatly reducing the photovoltaic power generation capacity, so that the purpose of reducing the cost is achieved.

Description

Control and distribution method and device of photovoltaic power generation system
Technical Field
The invention belongs to the technical field of wireless charging, and particularly relates to a control and distribution method and device of a photovoltaic power generation system.
Background
At present, the research and the popularization of the photovoltaic power generation technology are in the way of being in the way of China. As the year 4 of 2019, the cumulative installed capacity of the photovoltaic power generation in China reaches 19019 ten thousand kilowatts, a considerable part of the photovoltaic power generation is deployed in underdeveloped areas, and most of the photovoltaic power generation systems are distributed and household photovoltaic power generation systems with small and medium scales. The characteristic also enables the power supply device to effectively cover dead corners of a main power grid, and provides convenience for electricity taking in the local and nearby places.
On the other hand, development of wireless charging technology is also active. The technology is more and more widely applied to wireless power supply traveling vehicles for industrial use and wireless chargers for household appliances such as mobile phones and tablet computers. Because it need not to use the charging cable, so the flexibility strengthens greatly, is particularly useful for portable consumer or unmanned occasion.
With the new stage of the high-quality development of economy in China, the requirements of using the unmanned aerial vehicle for forest fire prevention inspection, hydrological and geographic investigation, power line inspection and the like are more and more strong, but the inspection range of the unmanned aerial vehicle is greatly limited due to the influence of adverse factors such as battery endurance mileage and charging inconvenience. Therefore, photovoltaic power generation and wireless charging technology are combined, support is provided for unmanned aerial vehicle endurance, and the current national economic development requirements are met.
Disclosure of Invention
The embodiment of the invention provides a control and distribution method and a control and distribution device for a photovoltaic power generation system, which are used for solving at least one of the technical problems.
In a first aspect, an embodiment of the present invention provides a control method for a photovoltaic power generation system, where the photovoltaic power generation system includes a load and a photovoltaic power generation device connected to the load, and the control method includes: presetting at least one voltage-power characteristic curve; responding to the obtained total power of the current load, and judging whether the variation of the current total power is larger than a preset trigger threshold value or not; and if the current variation of the total power is larger than the trigger threshold, controlling the photovoltaic power generation device to execute another voltage-power characteristic curve.
In a second aspect, an embodiment of the present invention provides a distribution method for a photovoltaic power generation system, where the distribution method includes: responding to the obtained total current of the current load, and judging whether the current total current is larger than the rated current output by the photovoltaic power generation device; and if the total current is greater than the rated current output by the photovoltaic power generation device, entering a rotation working mechanism.
In a third aspect, an embodiment of the present invention provides a control device for a photovoltaic power generation system, where the control device includes: the device comprises a presetting module, a power supply module and a control module, wherein the presetting module is configured to preset at least one voltage-power characteristic curve; the first judging module is configured to respond to the fact that the total power of the load is obtained, and judge whether the variation of the total power is larger than a preset trigger threshold value; and the execution module is configured to control the photovoltaic power generation device to execute another voltage-power characteristic curve if the current variation of the total power is larger than the trigger threshold.
In a fourth aspect, an embodiment of the present invention provides a distribution device for a photovoltaic power generation system, where the distribution device includes: the second judging module is configured to respond to the current total current of the load, and judge whether the current total current is larger than the rated current output by the photovoltaic power generation device; and the rotation module is configured to enter a rotation working mechanism if the total current is greater than the rated current output by the photovoltaic power generation device.
In a fifth aspect, an electronic device is provided, comprising: the system comprises at least one processor and a memory communicatively connected with the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the steps of the method for controlling and distributing a photovoltaic power generation system according to any embodiment of the invention.
In a sixth aspect, embodiments of the present invention also provide a computer program product, the computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the steps of the method for controlling and allocating a photovoltaic power generation system of any of the embodiments of the present invention.
The method and the device provided by the application have the following beneficial effects:
1. by collecting and analyzing parameters such as voltage and current on the line, the photovoltaic power generation device can be dynamically controlled to always work near the maximum efficiency point, so that the purposes of energy conservation and efficiency improvement are achieved.
2. By adopting a power dynamic distribution mode, the load charging requirement can be met on the basis of greatly reducing the photovoltaic power generation capacity, so that the purpose of reducing the cost is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flowchart of a control method of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 2 is a flowchart of a distribution method of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 3 is a flowchart of a distribution method of a photovoltaic power generation system according to another embodiment of the present invention;
fig. 4 is a topology diagram of a single-machine system structure of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 5 is a topological diagram of a network-based system architecture of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 6 is a flow chart of a dynamic response control of output power of a single-machine system of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 7 is a graph illustrating a stand-alone system power control of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 8 is a circuit topology diagram of a single-machine system of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 9 is a flow chart illustrating a dynamic power distribution control of a single-machine system of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating a network-based system dynamic power allocation control of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 11 is a topology diagram of a bus-shared operation of a plurality of photovoltaic charging terminals of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 12 is a block diagram of a control device of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 13 is a block diagram of a distribution device of a photovoltaic power generation system according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flowchart of an embodiment of a control method of a photovoltaic power generation system according to the present application is shown, where the control method of the photovoltaic power generation system according to the present embodiment may be applied to an intelligent terminal with a communication function, such as a notebook computer. The photovoltaic power generation system comprises a load and a photovoltaic power generation device connected with the load.
As shown in fig. 1, the photovoltaic power generation system of the present embodiment includes a load and a photovoltaic power generation device connected to the load. The control method of the photovoltaic power generation system comprises the following steps:
in step 101, at least one voltage-power characteristic curve is preset.
In this embodiment, for step 101, the control device sets different voltage-power characteristic curves in advance according to different loads, where the loads may be a video monitoring device, a lighting power supply, or a wireless charging platform, where the video monitoring device is a long-term load, the lighting power supply is a temporal load, and each wireless charging platform is a random load.
In step 102, in response to obtaining the total power of the current load, it is determined whether a variation of the current total power is greater than a preset trigger threshold.
In this embodiment, for step 102, the control device obtains the total power of all loads in the current photovoltaic power generation system in real time, and determines whether the variation of the total power in the current time period compared with the total power in the previous time period is greater than a preset trigger threshold.
In step 103, if the current variation of the total power is greater than the trigger threshold, the photovoltaic power generation device is controlled to execute another voltage-power characteristic curve.
In this embodiment, for step 103, if the current variation of the total power is greater than the trigger threshold, the control device controls the photovoltaic power generation device to execute another voltage-power characteristic curve. For example: during wireless charging, the working current of each charging platform is dynamically collected, the sum of the load currents is calculated, voltage-power characteristic curves are selected according to the values, when the load increase reaches a trigger threshold value, the photovoltaic power generation device executes the voltage-power characteristic curve corresponding to high output power, and when the load decrease reaches the trigger threshold value, the photovoltaic power generation device executes the voltage-power characteristic curve corresponding to low output power.
In the method, whether the current variation of the total power is larger than a preset trigger threshold is judged, so that the voltage-power characteristic curve executed by the photovoltaic power generation device is adaptively adjusted, the photovoltaic power generation device can always output the maximum output power under the condition that the output voltage is kept stable, and the purposes of energy conservation and efficiency improvement are achieved.
In some preferred embodiments, after the controlling the photovoltaic power generation apparatus to execute another voltage-power characteristic curve if the current variation amount of the total power is greater than the trigger threshold, the control method further includes: and adjusting the output power of the photovoltaic power generation device based on MPPT (maximum power point tracking), so that the output power is always at the working point of the maximum output power.
In the method of this embodiment, after the photovoltaic Power generation device executes the adapted voltage-Power characteristic curve, the photovoltaic Power generation device is further adjusted by using Maximum Power Point Tracking (MPPT), so that the photovoltaic Power generation device can reach the Point of Maximum output Power.
Referring to fig. 2, a flow chart of an embodiment of a distribution method of a photovoltaic power generation system of the present application is shown.
As shown in fig. 2, the distribution method of the photovoltaic power generation system includes the following steps:
in step 201, in response to obtaining the current total current of the load, it is determined whether the current total current is greater than a rated current output by the photovoltaic power generation device.
In this embodiment, for step 201, the distribution device obtains the current of the current load in real time, and determines whether there is a situation that the total current of the load is greater than the rated current output by the photovoltaic power generation device when the load is increased to a certain value. For example, when a plurality of long-term loads and random loads are simultaneously connected to the system, the distribution device may determine whether the total current of the loads is greater than the rated current output by the photovoltaic power generation device after the plurality of long-term loads and random loads are connected.
In step 202, if the total current is greater than the rated current output by the photovoltaic power generation device, a rotation working mechanism is entered.
Specifically, the rotation operating mechanism is to rotate to the next load after a certain load reaches a set power supply time.
In this embodiment, for step 202, if the total current is greater than the rated current output by the photovoltaic power generation device, the distribution device controls the load to enter the rotation operation mechanism, for example, when the wireless charging platforms are sequentially put into use, the system load may exceed the maximum capacity that can be provided by the photovoltaic device, and at this time, the wireless charging platforms will enter the rotation operation mechanism to sequentially supply power to the single or multiple wireless charging platforms.
In the method, a power dynamic distribution mode is adopted, so that the load charging requirement can be met on the basis of greatly reducing the photovoltaic power generation capacity, and the aim of reducing the cost is fulfilled.
Referring to fig. 3, a flow chart of an embodiment of a method for allocating a photovoltaic power generation system according to the present application is shown, wherein the flow chart is mainly a flow chart of steps further defined in the additional flow chart of fig. 2.
As shown in fig. 3, the distribution method of the photovoltaic power generation system further includes the following steps:
in step 301, if the total current is greater than the rated current output by the photovoltaic power generation device, calculating a power gap and querying power margins of other subsystems.
In this embodiment, when the "network type" configuration is adopted, the distribution device may further adopt an inter-system power distribution method, and if the total current is greater than the rated current output by the photovoltaic power generation device, the distribution device calculates a power gap and queries the power headroom of other subsystems connected through communication.
In step 302, a subsystem with a power margin is powered on.
In this embodiment, the distribution device powers the current subsystem with a subsystem for which there is a power margin.
In the method, aiming at the photovoltaic power generation system configured in a network mode, the capacity of the photovoltaic power generation device in a single system cannot meet the requirement of the load carried by the photovoltaic power generation device, and the energy supply request can be sent to other subsystems through communication, so that the requirement of charging the load is met on the basis of greatly reducing the photovoltaic power generation capacity, and the aim of reducing the cost is fulfilled.
Specifically, the power notch is calculated as follows:
Δ P ═ P load-Pmax;
in the formula, the load P is the load power of the load, and Pmax is the maximum power of the photovoltaic power generation device.
It should be noted that the above method steps are not intended to limit the execution order of the steps, and in fact, some steps may be executed simultaneously or in the reverse order of the steps, which is not limited herein.
The following description is provided to enable those skilled in the art to better understand the present disclosure by describing some of the problems encountered by the inventors in implementing the present disclosure and by describing one particular embodiment of the finally identified solution.
The inventor finds that the defects in the prior art are mainly caused by the following reasons in the process of implementing the application: the photovoltaic power generation is used as a power supply of the wireless charging device, the wireless charging device can be used for charging equipment such as an unmanned aerial vehicle, and the output power of the photovoltaic power generation device is difficult to control due to randomness and unpredictability of the total load of the system.
The inventor also found that: if the photovoltaic power generation device is required to meet the functional requirements under all working conditions, the capacity of the photovoltaic power generation device is larger than the sum of the capacities of all loads, but the working conditions are very rare, and therefore the installed photovoltaic capacity is determined to cause large waste.
The scheme of the application is designed and optimized mainly from the following aspects to achieve the purposes of energy conservation, efficiency improvement and cost reduction:
1) the photovoltaic power generation device output control method based on dynamic parameter response can dynamically control the photovoltaic power generation device by collecting and analyzing parameters such as voltage and current on a line, so that the photovoltaic power generation device always works near the maximum efficiency point, and the purposes of energy conservation and efficiency improvement are achieved;
2) the photovoltaic power generation device optimal cost control method based on dynamic power distribution can meet the load charging requirement on the basis of greatly reducing the photovoltaic power generation capacity through the power dynamic distribution method, and therefore the purpose of reducing the cost is achieved.
Referring to fig. 4, a topology diagram of a single-machine system architecture of a photovoltaic power generation system according to an embodiment of the present application is shown.
The method is suitable for areas with incomplete power and communication infrastructures, such as remote forest areas, reservoir areas and the like, and can cover a plurality of wireless charging platforms and corresponding lighting and video monitoring equipment by taking the photovoltaic power generation device with the island type as a core.
Fig. 5 is a schematic diagram showing a network-based system topology of a photovoltaic power generation system according to an embodiment of the present application.
In addition, a switch device is installed on an electric energy transmission channel of each subsystem, and then the networking operation or the island operation can be selected according to the operation condition.
In a stand-alone system and a network system, a photovoltaic power generation device is a power supply part, and the rest is a load. Generally, the video monitoring device is long-term loaded, the lighting power supply is time-loaded, and each wireless charging platform is randomly loaded. Therefore, the total load of the system is random and unpredictable, which brings difficulty to the power control of the photovoltaic power generation device.
In the prior art, under the control of the MPPT method, the photovoltaic device always operates near the maximum power point, but when the load variation is large, the power is difficult to always meet the requirement, resulting in large fluctuation of the output voltage.
Referring to fig. 6, a flow chart of a single-machine system output power dynamic response control of a photovoltaic power generation system according to an embodiment of the present application is shown. The working principle is as follows:
the system sets n +2 working points, wherein the 1 st working point corresponds to long-term loads such as 24-hour video monitoring and the like, and the 2 nd working point corresponds to increase temporal loads such as illumination and the like. During wireless charging, the working current of each charging platform is dynamically collected, the sum of the load currents is calculated, and working points are selected according to the values, wherein when the load is increased, the working points are correspondingly increased, and when the load is reduced, the working points are correspondingly reduced. Therefore, the photovoltaic power generation device is ensured to work near the maximum output power point all the time.
Referring to fig. 7, a stand-alone system power control graph of a photovoltaic power generation system according to an embodiment of the present application is shown.
The power curve is formed by combining a plurality of voltage-power characteristic curve parts. Firstly, the system is at a working point 1 (near the maximum power point of a curve 1) and corresponds to a long-term load, then a time load (such as illumination and the like) is put into use, because the system cannot respond instantly, the output voltage drops for a short time, the system is automatically set to the working point 2 at the moment, under the control of MPPT, the system runs to the working point 2 (near the maximum power point of the curve 2) shown in the graph 7 along the curve 2, and the like. The final result is that the system always works near the maximum output power point under different load working conditions on the premise of ensuring that the output voltage is relatively constant, so that the aims of energy conservation and efficiency improvement are fulfilled.
Wherein, the triggering power of each working point can be determined according to the following formula,
{P2＝P1+Ptime of flight；
In the formula, PLong and longFor long-term loading, PTime of flightFor the time load, eta is the conversion coefficient of the wireless charging platform, and u and i are the voltage and current values of the charging platform respectively.
Referring to fig. 8, a circuit topology diagram of a single-machine system of a photovoltaic power generation system according to an embodiment of the present application is shown.
The structure shown in fig. 8 can be divided into an upper part and a lower part, wherein the lower part is a control unit, a single chip microcomputer or a DSP and other devices can be adopted, and the upper part is a power unit, so that the storage, conversion and power supply to the load of photovoltaic power generation energy can be realized.
When the control method of the photovoltaic power generation system is adopted, data of n +2 control curves are stored in a controller in advance, a current proper working point is determined according to real-time detection and calculation of load voltage and current, a PWM signal is generated according to the control method of the photovoltaic power generation system and is sent to a conversion device in a power unit, and the device is generally built by power electronic devices such as MOSFET (metal oxide semiconductor field effect transistor) or IGBT (insulated gate bipolar transistor).
Referring to fig. 9, a flow chart of a single-machine system dynamic power allocation control of a photovoltaic power generation system according to an embodiment of the present application is shown.
As shown in fig. 9, the power supply of the long-term load and the time-based load is ensured, but when the wireless charging platform is put into use in sequence, the system load may exceed the maximum capacity that can be provided by the photovoltaic device. And at the moment, a rotation working mechanism is entered, and the power is supplied to the single or a plurality of wireless charging platforms in sequence. Let the load capacity of the wireless charging platform be p, and the maximum capacity that the photovoltaic power generation device can provide be pmaxThen, the number n of the wireless charging platforms capable of being charged simultaneously is as follows:
Figure BDA0002732637850000091
the time of each charging can be set by self, and the charging is carried out in sequence and circularly after the set time is reached and the charging is carried out to the next platform by turns.
Let tp be the maximum charging time allowed by the unmanned aerial vehicle, ts be the time that the wireless charging platform is full of the unmanned aerial vehicle battery, when tp < ts, the control scheme is not optimized probably, and unmanned aerial vehicle can only continue a journey under the circumstances that is not full of each time, and when tp > ts, the capacity of photovoltaic power generation device can be optimized as follows:
Figure BDA0002732637850000092
when the "network type" configuration is adopted, the power distribution method between systems can also be adopted, and the control flow is shown in fig. 10.
Fig. 11 shows a bus-shared operation topology diagram of a plurality of photovoltaic charging terminals of a photovoltaic power generation system according to a specific embodiment of the present application.
If the capacity of the photovoltaic power generation device in the single-machine system cannot meet the requirement of the load carried by the photovoltaic power generation device, the photovoltaic power generation device can send energy supply requests to other subsystems through communication, the energy supply requests are polled in a mode from far to near, the allowance of two adjacent subsystems is firstly inquired, if the requirement can be met, the energy supply switch can be switched on, and each subsystem enters a 'common bus' operation condition. Of particular note, the following conditions should be met:
(1) the capacity of the direct current bus capacitor is properly increased to meet the operation condition of 'common bus';
(2) the capacity of an inverter module in photovoltaic power generation of each subsystem is properly increased so as to meet the operation condition of 'common bus';
(3) in "networked" dynamic power allocation, the subsystems participating in the allocation are not well separated.
Referring to fig. 12, a block diagram of a control device of a photovoltaic power generation system according to an embodiment of the present invention is shown.
As shown in fig. 12, the control device 400 includes a presetting module 410, a first determining module 420 and an executing module 430.
The presetting module 410 is configured to preset at least one voltage-power characteristic curve; a first determining module 420, configured to determine, in response to obtaining the current total power of the load, whether a variation of the current total power is greater than a preset trigger threshold; an executing module 430, configured to control the photovoltaic power generation apparatus to execute another voltage-power characteristic curve if the current variation of the total power is greater than the trigger threshold.
Referring to fig. 13, a block diagram of a distribution device of a photovoltaic power generation system according to an embodiment of the invention is shown.
As shown in fig. 13, the distribution device 500 includes a second determination module 510 and a rotation module 520.
The second judging module 510 is configured to, in response to obtaining the current total current of the load, judge whether the current total current is greater than a rated current output by the photovoltaic power generation apparatus; and a rotation module 520 configured to enter a rotation working mechanism if the total current is greater than the rated current output by the photovoltaic power generation device.
It should be understood that the modules depicted in fig. 12 and 13 correspond to various steps in the methods described with reference to fig. 1, 2, and 3. Thus, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in fig. 12 and 13, and are not described again here.
In other embodiments, the present invention further provides a non-volatile computer storage medium, where the computer storage medium stores computer-executable instructions, and the computer-executable instructions may execute the method for controlling and allocating a photovoltaic power generation system in any of the above method embodiments;
as one embodiment, a non-volatile computer storage medium of the present invention stores computer-executable instructions configured to:
presetting at least one voltage-power characteristic curve;
responding to the obtained total power of the current load, and judging whether the variation of the current total power is larger than a preset trigger threshold value or not;
and if the current variation of the total power is larger than the trigger threshold, controlling the photovoltaic power generation device to execute another voltage-power characteristic curve.
As one embodiment, a non-volatile computer storage medium of the present invention stores computer-executable instructions configured to:
responding to the obtained total current of the current load, and judging whether the current total current is larger than the rated current output by the photovoltaic power generation device;
and if the total current is greater than the rated current output by the photovoltaic power generation device, entering a rotation working mechanism.
The non-volatile computer-readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the control and distribution device of the photovoltaic power generation system, and the like. Further, the non-volatile computer-readable storage medium may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the non-transitory computer readable storage medium optionally includes memory located remotely from the processor, which may be connected to the control and distribution device of the photovoltaic power generation system over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Embodiments of the present invention also provide a computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform any of the above methods of controlling and allocating a photovoltaic power generation system.
Fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 14, the electronic device includes: one or more processors 610 and a memory 620, with one processor 610 being an example in fig. 14. The apparatus of the control and distribution method of the photovoltaic power generation system may further include: an input device 630 and an output device 640. The processor 610, the memory 620, the input device 630, and the output device 640 may be connected by a bus or other means, and fig. 14 illustrates an example of a connection by a bus. The memory 620 is a non-volatile computer-readable storage medium as described above. The processor 610 executes various functional applications of the server and data processing by running the nonvolatile software programs, instructions and modules stored in the memory 620, namely, implements the control and distribution method of the photovoltaic power generation system of the above method embodiment. The input device 630 may receive input numeric or character information and generate key signal inputs related to user settings and function controls of the control and distribution device of the photovoltaic power generation system. The output device 640 may include a display device such as a display screen.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
As an embodiment, the electronic device is applied to a control and distribution device of a photovoltaic power generation system, and is used for a client, and the electronic device includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
presetting at least one voltage-power characteristic curve;
responding to the obtained total power of the current load, and judging whether the variation of the current total power is larger than a preset trigger threshold value or not;
and if the current variation of the total power is larger than the trigger threshold, controlling the photovoltaic power generation device to execute another voltage-power characteristic curve.
As an embodiment, the electronic device is applied to a control and distribution device of a photovoltaic power generation system, and is used for a client, and the electronic device includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to:
responding to the obtained total current of the current load, and judging whether the current total current is larger than the rated current output by the photovoltaic power generation device;
and if the total current is greater than the rated current output by the photovoltaic power generation device, entering a rotation working mechanism.
The electronic device of the embodiments of the present application exists in various forms, including but not limited to:
(1) a mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include smart phones (e.g., iphones), multimedia phones, functional phones, and low-end phones, among others.
(2) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as ipads.
(3) A portable entertainment device: such devices can display and play multimedia content. Such devices include audio and video players (e.g., ipods), handheld game consoles, electronic books, as well as smart toys and portable car navigation devices.
(4) The server is similar to a general computer architecture, but has higher requirements on processing capability, stability, reliability, safety, expandability, manageability and the like because of the need of providing highly reliable services.
(5) And other electronic devices with data interaction functions.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A control method of a photovoltaic power generation system including a load and a photovoltaic power generation device connected to the load, characterized by comprising:
presetting at least one voltage-power characteristic curve;
responding to the obtained total power of the current load, and judging whether the variation of the current total power is larger than a preset trigger threshold value or not;
and if the current variation of the total power is larger than the trigger threshold, controlling the photovoltaic power generation device to execute another voltage-power characteristic curve.
2. The method according to claim 1, wherein after controlling the photovoltaic power generation apparatus to execute another voltage-power characteristic curve if the current variation of the total power is greater than the trigger threshold, the method further comprises:
and adjusting the output power of the photovoltaic power generation device based on MPPT (maximum power point tracking), so that the output power is always at the working point of the maximum output power.
3. A method of distributing a photovoltaic power generation system, the method comprising:
responding to the obtained total current of the current load, and judging whether the current total current is larger than the rated current output by the photovoltaic power generation device;
and if the total current is greater than the rated current output by the photovoltaic power generation device, entering a rotation working mechanism.
4. The distribution method of the photovoltaic power generation system as claimed in claim 3, wherein the rotation operation mechanism is to rotate to the next load after a certain load reaches the set power supply time.
5. The distribution method of the photovoltaic power generation system according to claim 3, wherein after determining whether the total current is greater than the rated current output by the photovoltaic power generation device in response to obtaining the total current of the load, the power distribution method comprises:
if the total current is larger than the rated current output by the photovoltaic power generation device, calculating a power gap and inquiring the power allowance of other subsystems;
and (4) supplying the current subsystem with a certain subsystem with power margin.
6. The method of claim 5, wherein the power gap is calculated as follows:
ΔP＝Pload(s)-Pmax；
In the formula, PLoad(s)Is the load power of the load, PmaxThe maximum power of the photovoltaic power generation device.
7. A control device of a photovoltaic power generation system, characterized by comprising:
the device comprises a presetting module, a power supply module and a control module, wherein the presetting module is configured to preset at least one voltage-power characteristic curve;
the first judging module is configured to respond to the fact that the total power of the load is obtained, and judge whether the variation of the total power is larger than a preset trigger threshold value;
and the execution module is configured to control the photovoltaic power generation device to execute another voltage-power characteristic curve if the current variation of the total power is larger than the trigger threshold.
8. A distribution device of a photovoltaic power generation system, characterized in that the distribution device comprises:
the second judging module is configured to respond to the current total current of the load, and judge whether the current total current is larger than the rated current output by the photovoltaic power generation device;
and the rotation module is configured to enter a rotation working mechanism if the total current is greater than the rated current output by the photovoltaic power generation device.
9. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method of any one of claims 1 to 6.
10. A storage medium having stored thereon a computer program, characterized in that the program, when being executed by a processor, is adapted to carry out the steps of the method of any one of claims 1 to 6.
CN202011122870.8A 2020-10-20 2020-10-20 Control and distribution method and device of photovoltaic power generation system Pending CN112363560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011122870.8A CN112363560A (en) 2020-10-20 2020-10-20 Control and distribution method and device of photovoltaic power generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011122870.8A CN112363560A (en) 2020-10-20 2020-10-20 Control and distribution method and device of photovoltaic power generation system

Publications (1)

Publication Number Publication Date
CN112363560A true CN112363560A (en) 2021-02-12

Family

ID=74507385

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011122870.8A Pending CN112363560A (en) 2020-10-20 2020-10-20 Control and distribution method and device of photovoltaic power generation system

Country Status (1)

Country Link
CN (1) CN112363560A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113306727A (en) * 2021-05-25 2021-08-27 成都锐能科技有限公司 Power distribution method, device and system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103647501A (en) * 2013-12-09 2014-03-19 湖南大学 Photovoltaic power structure and maximum power tracking control method
CN107957742A (en) * 2017-10-20 2018-04-24 宝沃汽车（中国）有限公司 Method of supplying power to, device, photovoltaic controller and the electric automobile of electric automobile
CN108075324A (en) * 2016-11-15 2018-05-25 太阳能安吉科技有限公司 Intelligent socket
US20190131793A1 (en) * 2017-10-26 2019-05-02 Sungrow Power Supply Co., Ltd. Communication Host And Photovoltaic Power Generation System
CN209329672U (en) * 2018-12-18 2019-08-30 深圳市优必选科技有限公司 A kind of current protecting circuit for high-pressure system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103647501A (en) * 2013-12-09 2014-03-19 湖南大学 Photovoltaic power structure and maximum power tracking control method
CN108075324A (en) * 2016-11-15 2018-05-25 太阳能安吉科技有限公司 Intelligent socket
CN107957742A (en) * 2017-10-20 2018-04-24 宝沃汽车（中国）有限公司 Method of supplying power to, device, photovoltaic controller and the electric automobile of electric automobile
US20190131793A1 (en) * 2017-10-26 2019-05-02 Sungrow Power Supply Co., Ltd. Communication Host And Photovoltaic Power Generation System
CN209329672U (en) * 2018-12-18 2019-08-30 深圳市优必选科技有限公司 A kind of current protecting circuit for high-pressure system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113306727A (en) * 2021-05-25 2021-08-27 成都锐能科技有限公司 Power distribution method, device and system

Similar Documents

Publication Publication Date Title
US20200073427A1 (en) Aggregation system, method for controlling same, and complex power conversion device
WO2020077786A1 (en) Energy control method and device, energy management system, and storage medium
CN110661278A (en) Energy storage air conditioning system and control method and control device thereof
CN105515055A (en) Smart home electricity control method and system
EP4124500A1 (en) Charging control method, charging system, and related device
CN116565926A (en) Intelligent energy scheduling method and device based on scene activity energy consumption prediction
CN112363560A (en) Control and distribution method and device of photovoltaic power generation system
CN111775758B (en) Power supply control method and device for charging station, computer equipment and storage medium
CN117728473A (en) Off-grid energy storage system and control method
CN113022360A (en) Energy distribution method and device for charging station
CN216014019U (en) Intelligent electric quantity control system
CN110544951A (en) Frequency modulation method and device of energy storage system, server and storage medium
CN116231787A (en) Charging and discharging control method and device, terminal equipment and storage medium
CN105186495A (en) Power grid on-line data based running strategy optimization method for unified power flow controller
CN114893875A (en) Air conditioner control method and device and air conditioner
CN114987286A (en) Heat preservation method and device for vehicle power battery, vehicle and storage medium
CN114597927A (en) Distributed photovoltaic power generation energy storage method and device, electronic equipment and medium
CN113206534A (en) Energy storage system power control method, controller and energy storage system
CN114331757A (en) Energy management method, energy management device, computer equipment and computer readable storage medium
US11038368B2 (en) Method of controlling power supply of caravan and power control device of caravan
CN113629764A (en) Charge-discharge control method and application device thereof
JP6075584B2 (en) Control device, energy management system, control method, and program
CN105227674A (en) Internet data center&#39;s power cost control method and system
CN112531801B (en) Charging method and device
CN111277028B (en) Charging system, control method and control device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20210212

RJ01 Rejection of invention patent application after publication